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ACR Enumeration Terry.ColeAMD.Com Fellow Advanced Development Lab AMD

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Compatibility with existing OS. Fit into existing compliance test strategies. ACR Riser ... 'Marriage' step ... reference boards to test risers independently ... – PowerPoint PPT presentation

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Title: ACR Enumeration Terry.ColeAMD.Com Fellow Advanced Development Lab AMD


1
ACR EnumerationTerry.Cole_at_AMD.Com
FellowAdvanced Development LabAMD
2
(No Transcript)
3
Purpose
  • This 45-minute presentation walks through the
    device enumeration process for ACR risers, with
    examples
  • Guidelines are presented for BIOS vendors and ACR
    riser device driver vendors, as well as
    motherboard and riser hardware vendors, that will
    make device enumeration work

4
ACR Enumeration
  • Introduction
  • Enumeration architecture
  • Enumeration procedure
  • Examples
  • Guidelines for driver andBIOS developers
  • What can you do next?

5
ACR EnumerationIntroduction
6
Introduction To Risers
  • Risers deliver functions needing connectors
  • More integrated than PCI cards, USB peripherals,
    and typically less cost
  • Less integrated and more flexible than
    mother-board down solutions
  • Motherboard down soldered to planar
  • Examples
  • Existing soft audio and modem codecs from
    multiple IP sources
  • New complete functions like networking, DSL,
    cable solutions

7
Example Risers
  • AMR, MDC, CNR, ACR
  • Serial/parallel port risers andUSB port risers

8
Introduction To ACR
  • ACR Advanced Communication Riser
  • A 2nd generation riser
  • AMR is the 1st generation riser
  • Group open to all in the industry
  • Goals of ACR SIG
  • Foster diverse and scalable comm, network and
    audio solutions
  • Reuse industry technology, components
  • Compatibility with existing OS
  • Fit into existing compliance test strategies

9
ACR Riser
10
ACR Risers
11
Scaleable Solution
  • Desktop
  • V.90
  • 2 Ch audio
  • Residential Client
  • V.90
  • 10/100Base-T
  • HomePNA 1 or 2
  • 2 Ch audio
  • Residential Gateway
  • V.90
  • 10/100Base-T
  • HomePNA 1 or 2
  • DSL/Cable
  • Multi-Channel Audio
  • Three ACR Risers
  • ACR.Basic - Desktop
  • ACR.Lite - Client
  • ACR.Hub - Gateway

One ACR Motherboard
12
Value To Driver Owners
  • Unique Plug and Play IDs are enabled
  • Ensures specific drivers are loaded
  • Gives more control to hardware owners
  • Chipset and motherboard components can be
    generic, many PHY and device vendors
  • PHY and riser components can more easily adapt to
    multiple controllers
  • Helps avoid multi-function drivers
  • No new paradigms or wholesale driver rewrites
    required!

13
ACR EnumerationArchitecture
14
ArchitectureIntroduction
  • The ACR specification provides enumeration
    mechanism to identify all ACR components to
  • BIOS
  • OS
  • Software device drivers
  • Ensures that
  • Device operating parameters are correctlyset by
    the BIOS
  • Correct set of drivers is loaded by the OS
  • Additional vendor-defined information
    isavailable to the device driver

15
ArchitectureEnumeration Functions
  • ACR enumeration has threedistinct steps
  • Inventory
  • Marriage
  • Configuration

16
Enumeration FunctionsInventory step
  • Riser related resources on MB arelisted in BIOS
    storage
  • Chipset controllers (network, audio, )
  • Motherboard down controllers
  • Each appears as a PCI based controller
  • Components on the riser are described in a serial
    ROM device
  • Network PHYs, modem and audio codecs
  • USB devices, serial devices, IPB devices
  • Each device attached to an ACR bus

17
Device InventoryBy buses
  • Devices are listed by bus and function
  • Bus AC-Link, USB, ACR Serial, Primary MII,
    Secondary MII, GPSI, 7WS, IPB

18
Device InventoryBy function
  • Devices are listed by bus and function
  • Function
  • Riser, Sound, Modem, HPNA, Ethernet, DSL,
    Wireless, Cable Modem, Other

19
Device InventoryACR Serial Bus
ACR
System
  • Two wire SMBus 1.0 compliant
  • Serial Data and Clock, no third control signal
  • EPROM at A7 or B0
  • Use Controller or GPIO

Card
Motherboard
Vdd
Vdd
pullups
SCL
SMBus/I2C
Serial
Host
EEPROM
Controller Or GPIO
SDA
other
devices
20
Device InventorySerial EPROM Data
  • EPROM data image looks similar to a linked list
  • Data format is variable length

21
Enumeration FunctionsMarriage step
  • Mapping of each riser resource to a MB resource
    determined by ACR function number one
    function per bus
  • Added requirements may be placed on PCI Vendor ID
    in EPROM
  • Added requirements may be contained by executable
    code in EPROM
  • Runtime environment provided by BIOS
  • Complete device motherboard riser
  • Will be configured with unique andproper
    identities

22
Enumeration FunctionsConfiguration step
  • Setup of controller to match riser
  • Vendor and Device ID copied from riser to PCI
    config space
  • Subsystem Vendor and Subsystem ID copied from
    riser to PCI config space
  • Optionally, PCI class, PCI latency, and PCI power
    management can also be copied

23
Enumeration FunctionsConfiguration step
  • Controllers are disabled if no riser resource is
    present
  • Controllers that may not be functionalare also
    disabled
  • Example, AC-97 configuration issues such as
    primary/secondary clock source conflicts

24
Net Result Of Enumeration
  • All special activity is pre-boot, making it
    compatible with existing OS
  • Unique Plug and Play IDs are enabled, a
    combination of motherboard/riser ID
  • BIOS not specific to riser
  • Marriages of risers to controllers can be
    restricted by either party
  • Unused components in highly integrated
    chipset/motherboard pose fewer issues
  • Invisible to OS and user

25
Examples
  • Useful enumeration pairings
  • Modem codec works with allgeneric controllers
  • MAC on motherboard works only if a compatible PHY
    on riser
  • HPNA PHY works if only one of several compatible
    controllers on motherboards
  • DSL controller on motherboard worksonly if
    specific riser in system
  • If it doesnt work, it doesnt appear in the PCI
    space to OS

26
ACR EnumerationProcedure
27
Procedure
  • Basic sequence of enumeration events
  • Hardware steps
  • BIOS steps
  • OS steps
  • Driver steps

28
Hardware And BIOS
  • Hardware
  • At power up/reset all PCI config registers
    areset to their defaults
  • Enable SMBus or GPIO
  • Under BIOS control
  • Search for ACR EPROM
  • Validate and store EPROM contents
  • Assign the parameters specified in the EPROM,
    plus its own defaults, to the PCI config space of
    each controller supported
  • Disable all ACR controllers that do not have
    devices attached to them
  • Make config space registers read-only

29
OS And Driver
  • Under operating system control
  • Scan the PCI bus and match .INF files to the ID
    registers in the configuration space
  • Load the appropriate device driver, pointed to
    by its entry in the INF file
  • Under control of the driver
  • Query the BIOS for ACR BIOS presence
  • Query the BIOS for the default IDs of ACR
    function controllers
  • Query the BIOS for the enumeration data or read
    it from the serial bus

30
Riser Design Goals
  • Riser should be designed to enumerate in any
    motherboard
  • EPROM data causes controller to be disabled
    unless motherboard contains an appropriate
    controller
  • Risers can be tested with
  • ACR SIG draft riser test assertions, and
  • ACR designated reference motherboards

31
Motherboard Design Goals
  • Any riser (AMR or ACR) can be plugged in and and
    it should enumerate fully
  • Motherboard can be tested with
  • ACR SIG draft motherboard test assertions, and
  • ACR SIG designated reference risers

32
ACR EnumerationExamples
33
AMR Compatible Modem
  • Shows AMR style, transferring only subsystem IDs
  • May also include other optional items
  • Riser serial number
  • ACR Serial bus size of EPROM
  • AC-Link Modem device checks if riser not
    compatible with all controllers

34
Sound And Modem
  • May include optional items like previous example
  • If audio features are proprietary, may include
    device checks to make sure right controller is
    present

35
Modem And HPNA
  • Shows use of device check
  • May also include optional latency, class, and
    power management values of PCI controller

36
Modem, HPNA And Ethernet
  • Note the easy modularity!

37
ACR EnumerationGuidelines for Driver and BIOS
Developers
38
Driver Guidelines
  • Use separate Vendor/Sub-vendor IDs when
    appropriate to ensure the right driver is loaded
  • Provide full and appropriate power management of
    riser resources through PCI power management
  • Make use of the ACR BIOS function to query
    standard and private information (protected and
    32-bit)

39
Driver Guidelines
  • Provide full support for as many combinations of
    controllers and risers as appropriate
  • Make use of the serial EPROM device-check
    features to ensure risers are only used with
    appropriate controllers
  • Make use of the serial EPROM features to ensure
    that drivers are only used with appropriate risers

40
BIOS Guidelines
  • Provide AMR style enumeration as a fallback when
    AMR card insertedinto ACR slot
  • Provide full description of any motherboard
    components that sharethe buses that connect to
    ACR slot
  • Provide all ACR BIOS functions in both protected
    mode and 32-bit format

41
BIOS Guidelines
  • Follow the ACR BIOS GuidelinesApplication Note
  • Pre-test BIOS against
  • ACR SIG draft motherboard test assertions

42
ACR EnumerationWhat Can You Do Next?
43
All Development TeamsWhat can you do next?
  • Use ACR instead of AMR
  • Follow ACR 1.0 spec, ACR Application Notes,
    AC-97, MII, and IPB
  • Identify your designs to ACR SIG
  • Can be used as examples in compliance testing and
    interoperability testing
  • Participate in future ACR SIG Plugfests

44
Motherboard VendorsWhat can you do next?
  • Consider moving to riser form-factor
  • SKU-dependent connectors
  • Entry level hardware that is often upgraded
  • Always ship with ACR BIOS!
  • Dont use designs that allow insertion of devices
    that conflict with ACR address
  • Make use of protection modesas appropriate
  • For more information, visit www.acrsig.org

45
Minimum ACR Motherboard
  • Provide the minimum motherboard connections
  • USB,
  • ACR serial,
  • AC-97

46
Motherboard VendorsWhat can you do next?
  • Submit motherboards to WHQL with one of the ACR
    SIG tested risers
  • They become candidates for reference boards to
    test risers independently
  • Pre-test motherboards against
  • ACR designated risers
  • ACR SIG draft motherboard test assertions
    document
  • WHQL system test
  • Each appropriate WHQL functional test (modem,
    audio, networking)

47
Riser VendorsWhat can you do next?
  • Provide ACR serial bus plus buses for your
    functions
  • Always ship risers with fully programmed EPROMs,
    including the riser company Vendor ID
  • Always strive to generate unique and complete
    Plug and Play IDs, relying on enumeration where
    appropriate
  • Always locate the serial EPROM at A7or B0 address

48
Riser VendorsWhat can you do next?
  • Use the ACR EPROM programming tool to generate
    error-free EPROM images
  • Dont put Ethernet PHY or audio codec down with
    connectors on riser
  • Put the PHY/codec on riser with connector
  • Design all resources so their idle power fits
    within one PCI idle slot power budget, in case
    they are unpaired

49
Riser VendorsWhat can you do next?
  • Submit risers to WHQL with one of the ACR SIG
    tested motherboards
  • They become candidates for reference risers to
    test motherboards independently
  • Pre-test risers against
  • ACR designated motherboards
  • ACR SIG draft riser test assertions document
  • Each appropriate WHQL functional test (modem,
    audio, networking)

50
More InformationWhat can you do next?
  • www.acrsig.org to view public information
  • info_at_acrsig.org to join and gain members-only
    access and to get Plugfest information
  • www.microsoft.com/hwtest for more information
    about WHQL testing

51
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